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Definition
| preserved remains or traces of living things |
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Definition
| a hollow area in sediment in the shape of an organism or part of an organism |
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Definition
| a solid copy of the shape of an organism |
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Definition
| fossils in which minerals replace all or part of an organism |
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Definition
| an extremely thin coating of carbon on rock |
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Definition
| a type of fossil that provides evidence of the activities of ancient organisms |
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Definition
| scientist who studies fossils |
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Definition
| the change in living things over time |
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Definition
| when an organism no longer exists on Earth and never will again |
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Definition
| the age of a rock compared to the ages of other rocks. |
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Definition
| the number of years that have passed since a rock formed |
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Definition
| the geological principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it |
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Definition
| formed when lava hardens on the surface and forms igneous rock |
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Definition
| formed when magma cools and hardens into a mass of igneous rock |
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Definition
| a break in the Earth's crust |
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| a fossil that is widely distributed and represent an organism that existed for a geologically short period of time |
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Definition
| a gap in the geological record |
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Definition
| the process by which the atoms of one element break down to form atoms of another element |
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Definition
| the amount of time it takes for half of the radioactive atoms of an element to decay |
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Definition
| a record of the geologic events and the evolution of life forms as shown in the fossil record |
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Definition
| one of the three long units of geological time between the Precambrian time and the present |
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Definition
| one of the units of time that eras are divided into |
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Definition
| a ball of dust, gas, and ice that orbits the sun |
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Definition
| animals without a backbone |
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Definition
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| an animal that lives part of its life on land and part of its life in water |
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Definition
| have scaly skin and lay eggs that have tough, leathery shells |
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Definition
| when many types of living things become extinct at the same time |
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Definition
| a vertebrate that controls its body temperate and feeds milk to its young |
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